export function MP(ak) {
  return new Promise(function (resolve, reject) {
   window.init = function () {
    resolve(BMap)
  }
  var script = document.createElement("script");
  script.type = "text/javascript";
  script.src = "http://api.map.baidu.com/api?v=2.0&ak="+ak+"&callback=init";
  script.onerror = reject;
  document.head.appendChild(script);
})
}